Parameter reference
SITRANS LR250 (PROFIBUS PA)
128
Operating Instructions, 08/2014, A5E32221386-AC
TVT shaper (2.5.11.)
Note
•
The range is –50 to 50 dB.
•
Shaper Mode (2.5.10.4.) must be turned ON in order for TVT shaper points to be
transferred.
Adjusts the TVT (Time Varying Threshold) at a specified range (breakpoint on the TVT). This
allows you to reshape the TVT to avoid unwanted echoes. There are 40 breakpoints arranged in
5 groups. (We recommend using SIMATIC PDM to access this feature.)
To use TVT shaper via SIMATIC PDM:
1.
Go to Level Meter > Setup > Signal Processing > TVT setup > Shaper Mode and select On.
2.
Open the menu Device – Echo Profile Utilities and click on TVT Shaper. For more detail see
TVT Shaper via SIMATIC PDM (Page 86).
To use TVT shaper via LUI (local user interface):
1.
Go to Shaper Mode (2.5.10.4.) and select ON.
2.
In TVT shaper, go to Breakpoints 1-9 (2.5.11.1.).
3.
Open Breakpoint 1 and enter the TVT Offset value (between –50 and 50 dB).
4.
Go to the next Breakpoint and repeat step 3 until all desired breakpoint values have been
entered.
Breakpoint 1-9 (2.5.11.1.)
Values
Range: –50 to 50 dB
Default: 0 dB
Breakpoint 10-18 (2.5.11.2.)
Values
Range: –50 to 50 dB
Default: 0 dB
Breakpoint 19-27 (2.5.11.3.)
Values
Range: –50 to 50 dB
Default: 0 dB